Napkin holder



FIG. 1 is a front plan view of my new design for a napkin holder which is also a mirror image of the rear plan view thereof;

FIG. 2 is a side plan view which is also a mirror image of the opposite side plan view thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a napkin holder, as shown and described. 